We are studying the excited-state dynamics of a multichromophoric pentad consisting of a naphthalenediimide (NDI) unit surrounded by four porphyrins. This system is potentially capable of mimicking two photosynthetic functions: light harvesting/excitation energy transfer (EET) and charge separation (CS).Ultrafast EET from the initially excited porphyrin to the central NDI is visible in the time resolved emission spectra between 0 and 3 ps and represented above. The fluorescence intensity between 620 and 720 nm due to the porphyrin decays in 0.6 ps whereas that between 720 and 790 nm due to the NDI rises on the same time scale. In polar solvent, this process is followed by CS.
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